I use the LM2574 for a lot of one-off applications the past decade or more. For a 4V application you would start with LM2574-ADJ. It is available in 8-pin DIP, although the surface mount part is just as amenable to dead-bugging, and does 0.5 amp no problem and runs perfectly cool. It does not take (by modern standards) the smallest switching inductors and I always do additional LC filtering at both input and output, so in terms of "board space" this is quite a hog compared to more modern higher frequency switchers.
Tim N3QE On Sun, Dec 4, 2016 at 2:46 PM, KA2WEU--- via time-nuts <time-nuts@febo.com> wrote: > Who has a good recommendation for a switching power supply circuit, 12V DC > in, 4 V/ 500mA out , Exactly 3.3 for IC voltage. > > 73 de Ulrich > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
